body {
  display: flex;
  flex-direction: column;
}
header {
  height: 44px;
  line-height: 44px;
  background-color: #f8f8f8;
  color: #101010;
  font-size: 18px;
  text-align: center;
  font-family: Microsoft Yahei;
}
main {
  background: url(../../assets/imgs/bg-1.png) no-repeat center center;
  background-size: cover;
  position: relative;
  flex: 1;
}
main div {
  position: absolute;
  left: 250px;
  top: 20px;
  width: 105px;
  height: 40px;
  line-height: 40px;
  border-radius: 20px 20px 20px 20px;
  background-color: #ffffff;
  text-align: center;
  border: 1px solid #bbbbbb;
}
main div .jump {
  border-left: 1px solid #bbbbbb;
  padding-left: 5px;
}
main h1 {
  position: absolute;
  left: 69px;
  bottom: 60px;
  color: #ffffff;
  font-size: 36px;
  text-align: center;
  font-family: SourceHanSansSC-bold;
  animation: run 2s linear;
}
@keyframes run {
  0% {
    font-size: 12px;
    bottom: 200px;
    opacity: 0;
  }
  100% {
    font-size: 36px;
    bottom: 60px;
    opacity: 1;
  }
}
footer {
  height: 40px;
  background: white;
}
